Running News Daily

Your physiology is beautifully unique. I sound like John Mayer if he was a physical therapist. Our bodies are wonderlands, even if our glutes are unmaintained landfills.

The individual uniqueness of athletes creates a problem, though. How can we understand our physiology in the broader context of training theory when every variable is a bell curve across the population? General equations work if you're smack-dab in the middle of the bell curve thiccness, but can be actively wrong and counterproductive as you venture into the standard deviation hinterlands.

Consider the equation that many of you might have heard about heart rate: 180 beats per minute minus age = approximately aerobic threshold, or the intensity level that serves as a top-end barrier for easy/steady running that should encompass around 80% of your training volume. While that equation is generally useful, it can be actively useless for individuals, especially aging athletes who are highly trained and have a much higher aerobic threshold than the equation would predict.

For me, the equation caps my easy runs at 145 heart rate. My actual aerobic threshold is 152 beats per minute in running (and 150 beats per minute in biking). In practice, that's almost a one-minute-per-mile difference in output. Training from a general equation would prevent me from accruing benefits from steadier paces, and I'd probably be slower at everything.

raining zones from your watch can also be atrocious. In the last few months, I have helped a few hundred listeners of our podcast calculate their heart rate zones (our episode on heart rate zones is here). And a lesson I learned is that some of the watch brands use algorithms that are less accurate than U2 in Spanish class. Zone Uno, Zone Dos, Zone Tres, Zone Catorce, Zone Biblioteca, etc. Some of the watch zones are set so low that I have no idea what they could possibly be measuring. 

So today, let's look at one simple way to calculate your heart rate zones to help you calibrate your training intensity. Knowing your intensity ranges is helpful because it optimizes your metabolic fitness, allowing the body to burn more fat at higher outputs, while supporting mitochondrial proliferation and efficiency, allowing both higher and lower intensities to take less energy. Disclaimer: exercise physiology terminology is always subject to evolving debate, particularly on Twitter (the world's town square, if the square was also where the town put the raw sewage). Here is my favorite infographic ever on the overlap of these principles, from Fluid Athletics (follow them on Instagram here). 

What Are Heart Rate Zones?

We'll be using the traditional Five-Zone model, contrasted with the Three-Zone model used in most training research, but it helps to understand both and how they interact. Heart rate is best thought of as a proxy for lactate concentrations. To simplify it a ton, lactate is produced as our bodies use glucose to fuel ATP production during glycolysis. Lactate is a fuel source for cells, and it's accompanied by a hydrogen ion that changes muscle pH and contributes to fatigue. A 2018 review in Cell Metabolism described the lactate shuttle where the cells use lactate for energy. If this shuttling mechanism is overstressed, lactate levels and fatigue rise and exercise becomes less sustainable. A great overview by Dr. Howard Luks is here.

When lactate concentrations begin to rise, intensity switches from easy to moderate, an inflection point known as LT1, broadly overlapping with aerobic threshold where athletes go from primarily burning fat to primarily burning glycogen. And when lactate levels rise more steeply at higher intensities, intensity transitions from moderate to hard, an inflection point known as LT2, broadly overlapping with traditional lactate threshold (or critical velocity, depending on the method of calculation). That encompasses the 3-Zone model used in research:

Those zones are used in research to determine intensity distribution. While these breakdowns are gross approximations, it can help to put some numbers on paper to get your bearings (all of these numbers have big error bars). 

So if we're using heart rate to approximate lactate and the associated physiological impacts of fatigue, why don't we just use lactate? Good question, you article-ruining jerk. In a perfect world, athletes may decide to prick themselves for blood lactate readings with every interval like they're Norwegian vampires. Practically, though, there's a lactate learning curve in the best of times that can lead to inaccurate data, and in the worst of times it can take some of the spontaneous artistry out of daily training. You can probably tell I'm scared of blood, needles, and vampires (whether traditional or sexy). 

But have blood-free hope! Using the method in the article, I have approximated zones for professional athletes that have later been validated in lab tests with small enough margins of error to be useful. However, it's key to get a full lab test for truly accurate data. Heart rate without lactate, metabolic, and/or ventilatory lab tests is like determining the time from where the sun is in the sky. With context clues, you can be close, but you wouldn't want to use it to cook a turkey.

Five-Zone Training Model

Now, let's finally get to the Five-Zone heart rate model that is used in most training approaches. The Three-Zone model is overlaid with green, yellow, and red (again, there is debate around the exact breakdown, particularly with the Zone three/Zone four delineation).

There are a few ways to set the zones, but I see the most repeatability and accuracy with the Lactate Threshold Heart Rate method pioneered by legendary coach Joe Friel. As outlined in Training Peaks, he suggests that athletes "do a 30-minute time trial all by yourself (no training partners and not in a race). Again, it should be done as if it was a race for the entire 30 minutes. But at 10 minutes into the test, click the lap button on your heart rate monitor. When done, look to see what your average heart rate was for the last 20 minutes." 

I like athletes to do the test on uphills, where they won't be limited by neuromuscular and biomechanical factors if they don't have a ton of speed training. If it wasn't a truly hard effort or your heart rate takes a lot of time to increase across an effort, you can take the average heart rate from a section as short as 10 minutes. Because this isn't an exact measurement like in a lab test, think of it as an art that is useful in understanding your body, rather than attempting to find a correct answer like high school algebra.

For an easy way to scrub complex data files with HR variation, you can use the Strava Sauce browser plug-in, highlight the area you want to examine, and it will give averages without ever lapping the watch. When I calculate zones for athletes, I have found that you can also approximate LTHR from almost any hard workout with intervals 3 minutes or over by looking for spots in the file where heart rate stabilizes for 15-30 seconds before rising to less sustainable levels (and sometimes falling back toward that baseline in longer efforts). Be careful about using data from very hot days or long races over 90 minutes, when heart rate can sometimes be sustained above Friel's LTHR in ways that are not mirrored by the underlying physiology. 

A big key here: the data needs to be accurate. Chest-straps are ideal for these purposes, and if you are doing a workout to set heart rate zones, it's worth using the chest strap even if it feels like you're getting the heimlich maneuver from a weak octopus. While wrist-straps are rapidly improving in accuracy, there is extreme variation among athletes/watch brands. For example, my Garmin 745 seems to work really well in most circumstances (see this beautiful graph of a threshold workout). But other athletes don't have that success, and sometimes they send me heart rate files that look like Bitcoin price graphs (we are not sure why it's going up and down, but we can be pretty sure it's nefarious). 

How to Set Your Heart Rate Zones

Once you have the LTHR number, it's time to set those elusive zones. We're at another controversial point where the exact percentages are subject to extreme debate. The problem: when you validate heart rate data with lab tests, individual physiology varies substantially. LTHR narrows down that physiological variation to get an idea of zones, but the exact delineation depends on training history, muscle fiber typology, metabolic context, astrological sign, etc. Don't even get me started on Scorpios.

Here are the percentages that Megan and I like to use:

Let's dig into an example from my data. In February, I did a virtual bike race up a mountain. Using the Strava Sauce plug-in and highlighting the final 20 minutes of that hard effort, my LTHR was 172. While there is variance across sports and my heart rate is higher with running, that means my current zones for biking are approximately:

Your LTHR may increase with training and it will drop with age. Athletes are often between 165 and 175, though in professional athletes, I have seen numbers as high as 189 and as low as 152. You can see why dialing in your unique physiology is so important. An athlete with an LTHR of 160 needs to cap most of their easy runs at 140 heart rate (top end of Zone 2). Meanwhile, an athlete with an LTHR of 180 can go all the way up to 157! Often, everything about those athletes can look the same from the outside-same age, same PRs, same training, same potential. But they have very different hearts.

How To Use Your Heart Rate Zones

There are two places where having a general feel for your personal heart rate zones can be most helpful: understanding your Zone 2 (with LT1 as a cap) and determining the sustainability of longer efforts. First, let's break down how to think about each of the zones:

Knowing that Zone two cutoff can help calibrate an athlete's effort so they understand what terms like "easy," "steady," and "moderate" actually mean. Spot-checking heart rate periodically on harder efforts can ensure that athletes aren't going too hard, pushing everything into Zone five and reducing aerobic adaptations. I love athletes to get a feel for how high their heart rate gets on uphills especially, since excessive effort on ups can lead to reduced endurance and race performance. Zone 3 is your friend, in moderation. Zone four is your acquaintance. And spending too much time with Zone five will end with you folded up in a car trunk somewhere outside Las Vegas.

Takeaway

The big takeaway is that heart rate is just a proxy for fatigue processes, especially when calculated outside of a lab. The numbers can vary by the day, and they change across training blocks. Temperature, stress, caffeine, and political news all impact the numbers enough that caring too much about a few beats per minute is unhelpful. The day I first heard the nickname "Meatball Ron," I was in Zone three while sitting on the couch.

Instead, view heart rate as a way to calibrate your physiology in a general way, spot-checking your perceived exertion so that you know what you think your body is doing generally aligns with what your body is actually doing. Once an athlete dials in heart rate, I like them to look at it once every couple weeks during a run, and solely after-the-fact on other runs (if at all), never investing too much in small changes. Heart rate sometimes takes a while to respond, so I find it's rarely useful on shorter intervals.

If you train within the correct general range of intensities, whether guided by heart rate, lactate, and/or perceived exertion, you can improve output at Zone two and Zone three heart rates in particular, and because those efforts are more sustainable metabolically, you'll excel in races. You definitely don't need to have a heart rate monitor to achieve those goals. But you do need to have a good feel for your unique physiology. 

All of our bodies can be well-calibrated wonderlands. We sometimes just need a little bit of the sexiest thing of all: data.

Melissa Jefferson-Wooden delivered a sensational performance in Budapest, storming to victory in the women’s 100m at the inaugural World Athletics Ultimate Championship in a breathtaking 10.62 seconds.

The American produced a superb display of acceleration and composure to claim the World Ultimate Championship title while recording the fastest women’s 100m time in the world this year. Her 10.62 mark underlined her exceptional form and placed her firmly at the top of the global sprinting hierarchy.

Jefferson-Wooden controlled the race through the decisive stages and maintained her form all the way to the finish to secure a statement victory against a field packed with championship pedigree. She crossed the line ahead of Olympic champion Julien Alfred, who clocked 10.74 seconds with a -0.2 m/s wind, while Sha’Carri Richardson took third in 10.76.

Women’s 100m Final

1. Melissa Jefferson-Wooden — 10.62

2. Julien Alfred — 10.74 (-0.2 m/s)

3. Sha’Carri Richardson — 10.76

The victory was especially significant given the quality of the opposition. Jefferson-Wooden held her nerve against Alfred and Richardson, two of the most accomplished sprinters of the current generation, to produce the fastest performance in the world this year when it mattered most.

Alfred once again demonstrated her consistency at the highest level by taking silver, while Richardson completed an all-star podium in a race that brought together three of the biggest names in women’s sprinting.

But beyond the time, the title and the celebration, one of the most touching moments came after the race when Jefferson-Wooden embraced her father, Melvin, in an emotional celebration.

Their moment carried a deeply personal meaning. When Melissa was just 17 years old, she donated her stem cells to help her father undergo a bone marrow transplant after he was diagnosed with myelodysplastic syndrome. Years later, the two shared an unforgettable embrace in Budapest after she had become the World Ultimate Champion.

For Jefferson-Wooden, however, the evening was about far more than a medal. It was the culmination of an extraordinary journey, now highlighted by a world-leading 10.62 seconds on one of the biggest stages in athletics.

With the Ultimate Championship title secured and her father by her side, Jefferson-Wooden leaves Budapest with more than being an ultimate champion. She leaves with momentum, confidence and a powerful statement of intent — turning a high-profile showdown into one of the defining sprint performances of her season.

Audrey Werro has added another major title to her extraordinary season, storming to victory in the women’s 800m at the inaugural World Athletics Ultimate Championships in Budapest.

The Swiss star delivered a commanding performance, taking control from the opening gun and refusing to surrender the lead as she powered through an absorbing battle against two of the biggest names in the event.

Werro stopped the clock at 1:55.88 to become the Ultimate Championships 800m champion, producing another statement performance on one of the sport’s newest and most prestigious stages.

Behind her, Great Britain’s Keely Hodgkinson fought her way to second in 1:56.26, while the Netherlands’ Femke Broeders-Bol completed the podium in 1:56.74.

The result once again brought together the same formidable trio that featured on the podium at the European Championships, but Werro again proved to be the athlete who could rise above the challenge when it mattered most.

Her Budapest triumph is the latest chapter in a season that has already included records, a successful Diamond League Trophy defence and European Championship gold. Now, she can add the Ultimate Championships crown to a growing list of accomplishments.

Werro’s consistency has been particularly impressive in an 800m event packed with elite talent. Rather than simply relying on a fast finish, the Swiss athlete showed her authority by taking the initiative from the beginning and maintaining enough strength and composure to hold off Hodgkinson and Broeders-Bol all the way to the line.

The victory also underlined the remarkable depth of the women’s 800m, with three athletes separated by less than a second at the finish. Hodgkinson’s 1:56.26 and Broeders-Bol’s 1:56.74 showed just how fiercely contested the race was, but Werro’s decision to dictate the pace ultimately gave her the decisive advantage.

For Werro, this was more than another medal. It was another opportunity to demonstrate that her rise is no passing moment. On a stage featuring established champions and elite rivals, she once again produced the performance required to claim the biggest prize.

For Hodgkinson, the silver medal adds another major podium finish, while Broeders-Bol once again demonstrated her ability to compete with the very best over two laps.

But the spotlight in Budapest belonged unmistakably to Werro.

With another championship crown secured, the Swiss star has strengthened her claim as the athlete setting the standard in women’s 800m running. This is Audrey Werro’s era — and the rest of the field is chasing.

Busang Collen Kebinatshipi has delivered another sensational performance, storming to victory in the men’s 400m at the inaugural World Athletics Ultimate Championship in Budapest.

The reigning world champion stopped the clock at an astonishing 43.39 seconds, smashing his own Botswana national record and moving to fifth on the world all-time list.

Kebinatshipi produced a commanding finish to pull away from his rivals and secure the Ultimate Championship title. American star Rai Benjamin finished second in 44.15, while Jereem Richards of Trinidad and Tobago completed the podium in 44.23.

 Men’s 400m

1. Busang Collen Kebinatshipi — 43.39 NR

2. Rai Benjamin — 44.15

3. Jereem Richards — 44.23

The performance is even more remarkable considering that Kebinatshipi had already rewritten the Botswana record just one week ago in Brussels, where he ran 43.40. In Budapest, he lowered that mark by another 0.01 seconds to establish a new national record of 43.39.

That improvement has also propelled the 22-year-old into rare territory. His latest time now ranks him fifth fastest in history over 400m, placing him among an extraordinary group of athletes who have broken the 43.40 barrier.

Kebinatshipi's victory also caps an extraordinary season for the Botswana star. After establishing himself as a global champion, he has continued to demonstrate that he belongs among the very best one-lap runners in the world.

And there is a major reward for his historic night in Budapest: Kebinatshipi walks away as the Ultimate Champion and $150,000 richer.

From another national record to a place among the five fastest 400m runners ever, Kebinatshipi has turned an already remarkable season into something truly special.

Botswana has its latest sprinting superstar — and Kebinatshipi is showing that his ceiling may be even higher than anyone imagined. 

Marileidy Paulino once again proved why she is the undisputed queen of the one-lap event, powering to victory in the women’s 400m at the inaugural World Athletics Ultimate Championship in Budapest.

The Dominican Republic superstar produced a sensational 49.07 seconds to claim gold, pulling decisively away in the final straight and holding off a fiercely competitive field to extend her remarkable unbeaten run.

Paulino delivered her trademark combination of controlled speed and devastating finishing strength. She remained firmly in contention through the opening stages before unleashing her decisive move down the home straight, where she quickly opened a gap on her closest challengers.

Norway’s Henriette Jæger mounted a strong challenge but could not match Paulino’s finishing speed, crossing the line second in an impressive 49.28. Jamaica’s Nickisha Pryce completed the podium after clocking 49.56, ensuring that three of the world’s leading 400m talents occupied the medals.

The result once again underlined Paulino’s extraordinary consistency at the highest level. She entered Budapest as the world leader after running 48.48 in Paris in June, a performance that also set a Diamond League record. She subsequently remained unbeaten throughout her Diamond League campaign, closing the circuit with a meeting-record 48.64 in Brussels.

Budapest has also become a special venue in Paulino’s career. Three years ago, at the same National Athletics Centre, she captured her first individual world title, marking the beginning of another dominant chapter in her career. She later added Olympic gold in Paris in 2024, further establishing herself among the defining 400m athletes of her generation.

The inaugural World Athletics Ultimate Championship has brought together the sport’s biggest stars in a new winner-takes-the-spotlight format, with Olympic and world champions, Diamond League winners and leading performers competing for ultimate honours.

For Paulino, the occasion once again ended with Ultimate Crown on her arms.

With 49.07 seconds, she did more than win another major 400m title. She delivered another statement of authority, powering through the final straight with the confidence and speed that have made her one of the most dominant figures in modern women’s athletics.

Marileidy Paulino remains unbeaten, remains relentless and, once again, remains the queen of the one lap.

Jakob Ingebrigtsen has made a major decision regarding the remainder of his World Athletics Ultimate Championship campaign, confirming that he will withdraw from the men’s 1500m in Budapest despite producing a sensational performance to win the 5,000m title.

The Norwegian superstar stormed to victory in the inaugural Ultimate Championship 5,000m on Friday night, clocking a season-best 12:59.24 and delivering a devastating finishing kick to defeat Olympic 5,000m champion Cole Hocker and American Parker Wolfe.

Ingebrigtsen’s final 100 metres was arguably the defining moment of the race. The Olympic champion produced a remarkable 12.60-second closing 100m, powering away from the field to secure the $150,000 winner’s prize and underline just how far his fitness has progressed since returning from Achilles surgery.

The victory was particularly significant after what has been an extremely difficult period for the 25-year-old. Earlier in the season, Ingebrigtsen faced serious uncertainty over whether he would even be able to compete at the highest level again. His return has gradually gathered momentum, and his performance in Budapest offered perhaps the clearest indication yet that the Norwegian is rediscovering his formidable racing ability.

But rather than risk pushing his recovering body further, Ingebrigtsen has now opted to step away from the 1500m.

The decision means the highly anticipated showdown with British rival Josh Kerr will not take place in Budapest after all. The two stars had been expected to renew one of the biggest rivalries in modern middle-distance running in the 1500m final.

Instead, Ingebrigtsen is looking beyond the immediate opportunity and towards the bigger picture.

“I’m thinking about 2027… Fitness cannot be faked,” the Norwegian said, signalling that protecting his long-term condition has become more important than chasing another major victory only days after his return to peak-level competition.

The decision comes just one week after an emotionally charged Diamond League Final in Brussels, where Ingebrigtsen finished fourth in the 1500m behind Australia’s Cameron Myers, Kenya’s Phanuel Kipkosgei Koech and American Ethan Strand.

After that race, Ingebrigtsen delivered a fiery assessment of his rivals and questioned the tactics surrounding the pacemaking, particularly involving Hocker. He later acknowledged that there had been “a little too much adrenaline and emotion” when microphones were placed in front of him immediately after the race.

Yet his latest decision shows that beneath the emotion and competitive intensity lies a longer-term strategy.

Ingebrigtsen has already demonstrated that he can compete at an elite level again. His 12:59.24 in Budapest was not simply a victory — it was a statement that the Norwegian remains capable of producing a world-class finish even after months of injury rehabilitation.

Now, however, he is choosing not to gamble with that progress.

For a runner who has spent much of the year fighting his way back from injury, another 1500m race could have offered enormous rewards but also carried unnecessary risk. By withdrawing, Ingebrigtsen is effectively prioritising longevity over one more opportunity for immediate glory.

His message is clear: the comeback is underway, but it will not be rushed.

The 5,000m victory has given Ingebrigtsen confidence, momentum and perhaps, most importantly, proof that his body can once again handle elite competition.

Now comes the harder part — knowing when to stop.

With 2027 already firmly in his sights, the Norwegian has chosen recovery over risk. And after everything he has endured, that could ultimately prove to be one of the most important decisions of his comeback.

Jakob Ingebrigtsen is not walking away from the sport. He is protecting his future in it.